{application, db,
    [
        {description, "db server manager"},
        {vsn, "1"},
        {registered, []},
        {applications, [
            kernel,
            stdlib
        ]},
        {mod, {db_app, []}},
        {env, [
            {is_mnesia, false},
            {is_mysql, true},
            {is_redis, false},
            {mnesia_dir, "./mnesia_db"}
        ]}
    ]}.
